Optimisation suggestion

Server

I'm not a game developer, but maybe it makes sense to change the approach to dungeon validation? On the level of possible and impossible events/replays for example. It could even be postponed to the end of the dungeon, so that the validations are counted and replayed later. Yes, there will be a question with the loot, what to do in the case of validation failed, etc., but it will be just one of the tasks, but you will not need to race in the socket tons of data.

Again, I'm not a game dev, I'm sure your team is more competent at gaming than I am. But I'm still a developer and I realize that calculating bullets, registering hits and everything else that is done “on the fly” consumes a lot of bandwidth.

The game

Maybe compress pictures and sprites through the AI? I'm not that good at optimizing games, but it seems to me that moving a 1mb sprite would be easier than moving a 17mb sprite (not sarcasm, I'm pretty sure, but I haven't put it into practice).